Numerous things can cause a runny nose or rashes to suddenly appear on the skin but determining if these conditions are the result of an allergic reaction requires a professional diagnosis. Amongst the most common and successful methods used to test for allergies are skin tests. Allergy testing procedures inject or scratch a small quantity of the potential allergen, such as pollen extract, solution containing animal dander proteins and others under the skin.

Eczema, hives and other skin conditions are a common reaction in those who have a type of allergy called allergic contact dermatitis. It may be caused by sensitivity to hair dyes or perfumes. It can result from wearing rings made from certain metals like nickel or gold.